<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script>
        let str = "这课讲得真水";

        console.log(str.includes("水"));
        console.log(str.startsWith("难受"));
        console.log(str.endsWith("真水"));

        let tmp = `aaaaa
        回首掏
        走位,走位
        看不见,
        难受`;
        console.log(tmp)

    </script>
</head>
<body>



</body>
</html>